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Impulse Responses without the Impulse?

Added 2024-10-30 15:23:15 +0000 UTC

In this video, I explore the Unfilter plugin and how it goes beyond its usual use for reducing unwanted resonances in audio tracks. While I often use Unfilter to “clean up” audio, I recently discovered a feature that lets me export the unique resonance profile of a sound as an impulse response. This can be applied to another sound, helping two recordings “glue” together as if they were recorded in the same room. Here’s how this process works and some ideas for its creative use.

Overview of Unfilter: It's a high-cost plugin that “learns” the filtering applied to audio (e.g., room acoustics) and removes it, “flattening” the sound.
How Unfilter Works: It analyzes a sound to detect resonances or filters and applies an inverted filter to neutralize these.
New Feature – Export as Impulse Response: I found that you can save this filter profile as an impulse response file, which captures a sound’s room resonance profile.
Application for Gluing Sounds: You can load this impulse response into a convolution reverb, making a clean recording sound like it was captured in the same environment as the original.
Creative Uses: This feature is helpful for matching the tonal “space” of different instruments, blending digital and recorded sounds, or making disparate samples sound cohesive.

Unfilter offers creative ways to shape audio beyond resonance reduction, so I recommend experimenting if you have access to it!

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